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SIR,-I have to thank Mr. Gordon Welch for his kindly criticism of my article which
appeared in the September issue. His remarks are in accordance with the mathematical
implications of the slope deflection of isolated members, but it is interesting to note that in Clause No. 17 of the preliminary draft revision of the Institution report, resisting moment of connections is made the criterion of pillar restraint. My assessment is on more conservative lines, for I do not put it forward for buildings with wooden joist floors, unencasedsteel, corrugated steel or fully glazed sides.
In some clauses of the Draft there seems to be an underlying assumption that steel will be encased and floors made fire-resisting ; but, in my opinion, Clause No. 17 needs strengthening in order to reward the design of rigid type buildings and penalise those with wooden floor joists, etc.
-Mr. H. J. DEANE, B.Eng., M.Inst.C.E. (Past President), proposed a vote of thanks to Mr. Jackaman, and said that the information given concerning the driving and screwing of the piles would be valuable to members. Mr. Deane added that when he had first read the paper he had been disappointed because it had not contained so much data as he would have liked, but fortunately Mr. Jackaman had given some supplementary information
at the meeting, and Mr. Deane suggested that that should be published in The Structural Engineer. For example, the diagram relating to the screwed piles and the strata penetrated, and the notes of the progress of the sinking of the piles, were valuable.
When preparing this paper for the Institution, the time at my disposal was unexpectedly curtailed, and I regret I was unable to include in it the following information which I hope will be found of interest to members.